Java科学计算器程序代码1

计算器布局显示：

功能举例：

①13+20=33

②-7*14二-98:先输入7,再单击-/+将其变成负数，然后依次单击义

号、14及=

③7!=5040

@sin300=0.5:先输入30,然后按下'〃按钮转换成角度值，再按

下sin即可显示结果

⑤sqrt(4)=2:利用鼠标点击4后再点击sqrt按键即可显示结果

⑥2*n=6.2832

源程序如下：

importjava.awt.BorderLayout;

importjava.awt.Color;

importjava.awt.Dimension;

importjava.awt.Font;

importjava.awt.GridLayout;

importjava.awt.event.ActionEvent;

importjava.awt.event.ActionListener;

importjava.text.DecimalFormat;

importjavax.swing.BorderFactory;

importjavax.swing.ButtonGroup;

importjavax.swing.JButton;

importjavax.swing.JCheckBoxMenuItem;

importjavax.swing.JFrame;

importjavax.swing.JMenu;

importjavax.swing.JMenuBar;

importjavax.swing.JMenuItom;

importjavax.swing.JPanel;

importjavax.swing.JRadioButtonMenuItem;

importjavax.swing.JTcxtField;

publicclassCalucatorextendsJFrame{

privateJTextFieldtf;

privateJPanelpanel1,panel2,panel3,panel4;

privateJMenuBarmyBar;

privateJMenumenul,menu2,menu3;

privateJMenuItomeditlteml,editltem2,hclpl,holp2,

help3;

privateJRadioButtonMenuTternseeTteml,seeTtem2;7单选框

privateJCheckBoxMenuItemseel第选框

privateButtonGroupbgb;

privateStringback;

privatebooleanIfResult=true,flag=false;

privateStringoper=〃=”；

privatedoubleresult=0;

privateNumnumActionListener;

privateDecimalFormatdf;

publicCalucatorO{

super(〃科学计算器〃)；〃设置标题栏

df=newDecimalFormat("#.####〃)；//保留四位小数

this.setLayout(newBorderLayout(10,5));

panel1=newJPanel(newGridLayout(1,3,10,10));

pane12=newJPanel(newGridLayout(5,6,5,5));〃5行6

列

pane13=newJPanel(newGridLayout(5,1,5,5));

pane14=newJPanel(newBorderLayout(5,5));

*菜单栏

myBar=newJMenuBar();

menul=newJMcnu(〃编辑(E)〃)；

menu2=newJMenu(“查看(V)〃);

menu3=newJMenu("帮助(H)〃);

menul.selFont(newFont(〃宋体〃，Font.PLAINf12));

menu2.setFont(newFont(〃宋体〃，Font.PLAIN,12));

menu3.setFont(newFont(〃宋体〃，Font.PLATNy12));

*编辑栏

editlteml=newJMenuItem("复制(C)Ctrl+C，z);

editltem2=newJMenuItem(〃粘贴(P)Ctrl+Vz，);

menu3.addSeparator()；//添加一条分割线

nienu3.add(help2);

myBar.add(menul);

myBar.add(menu2);

myBar.add(menu3);

this.setJMenuBar(myBar);

numActionListener=newNum();〃实现数字监听

*文本域，即为计算器的屏幕显示区域

tf=newJTextFieldO;

tf.setEditable(false);.//文本区域不可编辑

tf.setBackground(Color,white);〃文本区域的背景色

tf.setHorizontalAlignment(JTextField.RIGHT);〃文字右

对齐

tf.setText("0");

tf.setBorder(BorderFactory.createLoweredBeve1Border^));

init();〃对计算器进行初始化

*初始化操作

*添加按钮

privatevoidinit(){

addButton(panel1,“Backspace”,newClear(),Color,red);

addButton(panel1,〃CE〃，newClearO,Color,red);

addButton(panel1,〃C〃，newClear(),Color,red);

addButton(pane12,newSigns(),Color,magenta);

addButton(panel2,〃log〃，newSigns(),Color,magenta);

addButton(panel2,〃7〃，numActionListener,Color,blue);

addButton(pane12,〃8〃，numActionListener,Color,blue);

addButton(pane12,〃9〃，numActionListener,Color,blue);

addButton(panel2,〃・〃，newSignsO,Color,red);

addButton(panel2,〃n!〃，newSigns(),Color,magenta);

addButton(panel2,〃sqrt〃，newSigns(),Color,magenta);

addButton(panel2,〃4〃，numActionListener,Color,blue);

addButton(panel2,〃5〃，numActionListener,Color,blue);

addButton(panel2,〃6〃，num/XctionListener,Color,blue);

addButton(panel2,〃X〃，newSigns(),Color,red);

addButton(panel2,〃sin〃，newSigns(),Color,magenta);

addButton(panel2,newSigns(),Color,magenta);

addButton(panel2,〃1〃，numActionListener,Color,blue);

addButton(panel2,〃2〃，numActionListener,Color,blue);

addButton(panel2,〃3〃，nunv\ctionListener,Color,blue);

addButton(panel2,、newSignsO,Color,red);

addButton(panel2,“cos”,newSigns(),Color,magenta);

addButton(pane12,，zx3/z,newSigns(),Color,magenta);

addButton(panel2,〃0〃，numActionListener,Color,blue);

addButton(panel2,〃一/+〃，newClear(),Color,blue);

addButton(pane12,newDot(),Color,blue);

addButton(panel2,〃+〃，newSigns(),Color,red);

addButton(panel2,newSigns(),Color,magenta);

addButton(pane12,〃旷,newSigns(),Color,magenta);

addButton(panel2,n〃，numActionListener

Color,orange);

addButton(panel2,〃e〃，numActionListener

Color,orange);

addButton(panel2,〃''〃，newSigns(),Color,orange)

addButton(panel2,〃=”,newSigns(),Color,red);

JButtonbtns=newJButton(〃计算器〃)；

btns.setBorder(BorderFactory.crcatcLowcredBcvolBorder0)

btns.setEnabled(false);//按钮不可操作

btns.setPreferredSize(newDimension(20,20));

panel3.add(btns);〃加入按钮

addButton(panel3,〃MC〃,null,Color,red);

addButton(panel3,“MR”,null,Color,red);

addButton(pane13,〃MS〃,null,Color,red);

addButton(panel3,〃M+〃,null,Color,red);

panel4.add(panel1,BorderLayout.NORTf/);

pane14.add(pane12,BorderLayout.CENTER);

this.add(tf,BorderLayout.NORT^h;

this,add(panel3,BorderLayout.WEST);

this.add(panel4);

pack();

this.setResizable(false);〃窗口不可改变大小

this.setLocation(300,200);

this.setDefaultCloseOperation(JFraire.EXIT_0N_CL0S^);

*统一设置按钮的的使用方式

*@parampanel

*@paramname

*©paramaction

*©paramcolor

privatevoidaddButton(JPanelpanel,Stringname,

ActionListeneraction,Colorcolor){

JButtonbt=newJButton(name);

panel.add(bt);〃在面板上增加按钮

bt.setForeground(color);//设置前景(字体)颜色

bt.addActionListener(action);〃增加监听事件

*计算器的基础操作(+-X-?)

*©paramx

privatevoidgetResult(doublex){

if(oper==〃+"){result+=x;}

elseif(oper=="-〃){result-=x;}

elseif(oper==〃X〃){result*=x;}

elseif(oper==〃+〃){result/-x;}

elseif(oper==〃=〃){result=x;}

tf.setText(df.format(result));

*运算符号的事件监听

classSignsimplementsActionListener!

publicvoidactionPerformed(ActionEvente){

*用ActionEvent对象的getActionCommand()方法

*取得及引发事件对象相关的字符串

Stringstr=e.getActionCommand();

/*sqrt求平方根*/

if(str.equals(〃sqrt〃)){

doublei=Double.parseDouble^i.getTextO);

if(i>=0){

*String.valueOf()转换为字符串

*df.format()按要求保留四位小数

*Math,sqrt()求算数平方根

tf.setText(String.valueOf(df.format(Math,sgrt⑴)));

else{

tf.setText(〃负数不能开平方根〃)；

/*log求常用对数*/

elseif(str.equals(，zlog，z)){

doublei二Double.parseDoublektY.getTcxt());

if(i>0){

tf.setText(String.valucOf{(\^.format(Math./og(i))));

}else(

tf.setText(〃负数不能求对数〃)；

/*%求百分**/

elseif(str.equals(〃%〃)){

tf.setText(df.format(Double.parscDoubie(tf.getTcxt())

100));

/*1/x求倒数*/

elseif(str.equals(〃l/x〃)){

if(Double.parseDoublekti.getlext())==0){

tf.setText(〃除数不能为零〃)；

}else{

tf.setText(df.format(1

Double.parseDouble^.getText())));

/*sin求正弦函数*/

elseif(str.equals(〃sin〃)){

doublei=Double.parseDouble(tf.getText());

tf.setText(String.valueOf{(\Y.format(Math,s力［(i))));

/*cos求余弦函数*/

elseif(str.equals(〃cos〃)){

doublei=Double.parscDouble{^.getText());

tf.setText(String.format(Math,cos⑴)));

/*tan求正切函数*/

elseif(str.equals(〃tan〃)){

doublei=Double.parseDoubl.getText());

tf.setText(String.valueOf{<\i.format(Math.才a〃(i))));

/*n!求阶乘*/

elseif(str.equals(〃n!〃)){

doublei=Double.parseDouble{tf.getText());

if((i%2==0)||(i%2==l))〃判断为整数放进行阶乘操

作

intj=(int)i;〃强制类型转换

intresult=l;

for(intk=l;k<=j;k++)

result*=k;

tf.setText(String,(result));

else

tf.sctTcxt("无法进行阶乘〃);

/*x^2求平方*/

elseif(str.equals(〃x-2〃)){

doublei=Double.parseDouble{^.getText());

tf.setText(String.valueOf^i.format(i*i)));

/*x'3求立方*/

elseif(str.equals{

doublei=Double.parseDouble{tf.getText());

tf.setText(String.valueOf^.format(i*i*i)));

/*'"角度转换*/

*将角度值转换成弧度值，方便三角函数的计算

elseif(str.equals(〃'"〃)){

doublei=Double.parseDouble{^.getText());

tf.setText(String.pa/ueOF(i/180*Math.77));

else{

if(flag){

IfResult=false;

if(TfResult){

oper=str;

}else{

getResult(Double.parseDouble^i.getText()));

oper=str;

IfResult=true;

*清除按钮的事件监听

classClearimplementsActionListenerI

publicvoidactionPerformed(ActionEvente){

*用ActionEvent对象的getActionCommand()方法

*取得及引发事件对象相关的字符串

Stringstr=e.getActionCommand();

if(str==〃C〃){

tf.setText(〃0〃)；

IfResult=true;

result=0;

}elseif(str==〃-/+〃){

doublei=0-

Double.parseDouble^i.getText().trimO);

tf.setText(df.format(i));

}elseif(str=="Backspace"){

if(Double.parseDoublekti,getlext())>0){

if(tf.getText().1ength()>1){

tf.setText(tf.getText().substring(O,

tf.getText().lengthO-1));

//使用退格删除最后一位字符

}else{

tf.setText(〃0〃)；

IfResult=true;

)else(

if(tf.getText().length()>2){

tf.setText(tf.getText().substring(O,

tf.getText().lengthO-1));

}else{